How to be prepared for forthcoming aptitude exams of various companies? Attach few sample aptitude question papers of companies like TCS, Infosys, L&T, Accenture etc.

Hello Sir ,
I would like to know about how to prepare for the aptitude tests.As I am persuaing my final year in engineering in BE (IT).How should i prepare for the fourth coming Aptitude exams of various companies.
Can i get some example Aptitude Paper questions of companies like TCS,INFOSYS ,L&T ,Accenture etc...